Subject: Clarify spdlog's license

From: Gábor Boskovits <[email-masked]>
Date: Thu, 20 Jun 2019 03:44:40 +0000

Fixed on master in commit 5543d3bb09e65107afe4f839c97285bb2106b70e
<http://git.savannah.gnu.org/cgit/guix.git/commit/?id=5543d3bb09e65107afe4f839c97285bb2106b70e>
.

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